DE212015000124U1 - Frame body, cell frame for a redox flow battery, and redox flow battery - Google Patents

Abstract

A frame body for use in a cell of a redox flow battery, comprising: an opening formed in the frame body; a passage through which an electrolyte can flow in a circle; and a slot connected to the opening and the passage, the slot forming a channel for the electrolyte between the opening and the passage, the slot having at least one bent portion whose radius of curvature is equal to or greater than 2 mm and less than or equal to 200 mm.

Description

TECHNICAL AREA

The present invention relates to a frame body used for a cell of a redox flow battery, a cell frame for a redox flow battery, and a redox flow battery. More particularly, the present invention relates to a frame body of a cell for a redox flow battery capable of improving heat dissipation of an electrolyte in a slit provided in the frame body while preventing loss by a sidestream through the electrolyte, and also a load which occurs at a formation portion of a slot.

STATE OF THE ART

As a large-capacity storage battery, a redox flow battery (also referred to as an RF battery hereinafter) is known (see Patent Documents 1 and 2). Known applications for the redox flow battery are load balancing, as well as compensation for instantaneous drop off and securing of power supply and balancing of power output from renewable energy sources such as solar, wind and the like, whose massive introduction is being driven forward.

An RF battery is a battery that performs charging and discharging using a positive electrode electrolyte and a negative electrode electrolyte, wherein an electrolyte includes a metal ion (an active material) having a valence variation by an oxidation reduction. 9 shows an operating principle of a vanadium-based RF battery 300 which uses, as an electrolyte for a positive electrode and a negative electrode electrolyte, a vanadium electrolyte containing a V ion serving as an active material. In 9 indicates an arrow with a solid line and an arrow with a dashed line in a battery cell 100 a charging reaction and a discharging reaction respectively.

An RF battery 300 includes a cell 100 placed in a cell with positive electrode 102 and a cell 103 with negative electrode through an ion exchange film 101 is separated, which allows hydrogen ions to penetrate. The cell 102 with positive electrode has a positive electrode 104 included in it and a tank 106 that is provided for the positive electrode electrolyte and stores the positive electrode electrolyte is with leads 108 . 110 with the cell 102 connected to a positive electrode. The cell 103 with negative electrode has a negative electrode 105 included in it and a tank 107 which is provided for the electrolyte for the negative electrode and stores the electrolyte for the negative electrode is with leads 109 . 111 with the cell 103 connected to negative electrode. By pumping 112 . 113 Will the electrolyte be in every tank 106 . 107 is stored, pumped in a circle and runs through cell 100 (Cell 102 with positive electrode and cell 103 with negative electrode) to perform charging and discharging.

In the RF battery 300 Typically, a configuration is applied that involves a cell stack that has multiple cells 100 has stacked in layers. 10 is a schematic diagram of a cell stack. A cell stack 10S who in 10 is shown, that this from a cell frame 20 who has a frame body 22 in the form of a rectangular frame and a bipolar plate 21 included in the frame body 22 is provided, a positive electrode 104 , an ion exchange membrane 101 , a negative electrode 105 , is formed so that they are stacked in multiple layers and this stack is between two end plates 250 trapped. The frame body 22 has an opening formed therein and cell frame 20 is such that a recess in the frame body 22 by fitting the bipolar plate in the opening of the frame body 22 is trained. In particular, the cell frame points 20 a depression (a chamber) 24 on that in the frame body 22 by an inner peripheral surface of the frame body 22 and a surface of the bipolar plate is formed and the positive electrode 104 is on a surface side of the bipolar plate 21 arranged and the negative electrode 105 is on the other surface side of the bipolar plate 21 arranged. frame body 22 who in 10 as an example is in the form of a rectangular frame made up of a pair of opposite upper and lower long pieces 22L and a pair of right and left short pieces 22S is formed with the ends of the long pieces 22 are connected. In chamber 24 in the frame body 22 is formed, are electrodes (positive electrode 104 or negative electrode 105 ) and an inner chamber of the chamber 24 that by the bipolar plate 21 is surrounded, the frame body 22 and the ion exchange membrane 101 form a cell (a positive electrode cell or a negative electrode cell). In the above cell stack 10S , as in 10 shown is a single one Cell (unit cell) 100 by arranging a pair of positive and negative electrodes 104 . 105 between adjacent cell frames 20 with an ion exchange membrane 101 formed arranged therebetween.

In the cell stack 10S an electrolyte flows through a passage 200 in the frame body 22 is formed and penetrates this, and a slot 210 which is attached to a surface of the frame body 22 is formed and a connection between the passage 200 and the chamber 24 provides. slot 210 has an end connected to the passage 200 and the other end connected to the chamber 24 on. In the cell stack 10S who in 10 is shown, the electrolyte for the positive electrode from a liquid supply passage 201 with a fluid delivery slot 212 supplied on the other surface side (corresponding to the rear side of the sheet of the drawing) of the frame body, fed to the chamber containing therein the negative electrode 105 and is provided with a liquid discharge slot 214 to the liquid discharge passage 204 drained. Between cell frames 20 In order to suppress leakage of the electrolyte is an annular sealing element 50 such as an O-ring or a flat gasket along an outer circumference of the frame body 22 arranged.

DOCUMENTS LIST

PATENT DOCUMENTS

• PTD 1: Japanese Patent Laid-Open Publication No. 2013-080613
• PTD 2: Japanese Patent Laid-Open Publication No. 2002-246061

PRESENTATION OF THE INVENTION

TECHNICAL PROBLEM

In the RF battery, when the slot is filled with an electrolyte in a charged state, a bypass current flows through the electrolyte in the slot and loss by the bypass (leakage current) is caused. An agent that reduces the side-flow is to lengthen the length of the slot that serves as the channel of the electrolyte to increase the electrical resistance of the electrolyte in the slot. Accordingly, from a conventional standpoint for reducing a side leakage, there is a case in which a means has been taken to form a bent portion at a portion of the slot to increase the length of the slot to be longer than a straight slot. The length of the slot means a length of the slot measured along the slot from one end to the other end when the cell frame (or frame body) is viewed in a plan view.

Providing the slot with a bent portion to increase the length of the slot, however, has a limit, and when the RF battery is operated, ready, or the like, when the slot is filled with electrolyte, a sidestream through the electrolyte is not in a small one Scale flow. This sidestream can cause the electrolyte to generate heat and have an elevated temperature. In particular, when the RF battery is in standby, the electrolyte remains in the slot and, accordingly, the temperature of the electrolyte in the slot increases more readily than when actuated as the electrolyte flows. When the temperature of the electrolyte is increased, a failure may occur in the electrolyte, and it is possible to have a reduction in battery performance by degenerating the electrolyte. In addition, when the temperature of the electrolyte is increased, the temperature may soften and deform the frame body and thus damage the frame body (or the cell frame). Accordingly, in order to suppress the elevation of the temperature of the electrolyte in the slot, there is a demand to improve the heat dissipation of the electrolyte.

Moreover, in the frame body for the cell of the RF battery, when the electrolyte flows, fluid pressure, thermal expansion, and the like are caused, resulting in stress applied to the workpiece forming the frame body in a longitudinal direction in a widthwise direction The like works and this load can end in a deformation. In particular, the frame body slot forming portion has a small thickness and is accordingly susceptible to deformation, and moreover, stress concentrates easily at a corner of the slot or the like, and when excessive load is applied, cracking can easily be caused the slot serves as a starting point. Accordingly, suppression of the stress occurring in the formation portion of the slot is desired. The "slit cross section" means a cross section orthogonal to a direction in which the electrolyte flows.

Conventionally, in order to reduce a side stream loss, provision has been made for providing a portion of a slot having a bent portion. However, the configuration of the bent portion of the slit has not been sufficiently studied from a viewpoint of improving the heat dissipation of the electrolyte and suppressing deformation of the formation portion of the slit.

The present invention has been made in consideration of the above circumstances, and an object of the present invention is to provide a frame body of a cell for a redox flow battery which can improve the heat dissipation of an electrolyte in a slot while reducing leakage current through the electrolyte. and also can suppress stress occurring at a formation portion of the slot.

THE SOLUTION OF THE PROBLEM

A frame body according to one aspect of the present invention is a frame body used for a cell of a redox flow battery, comprising: an opening formed in the frame body; a passage through which an electrolyte flows in a circle; and a slot connected between the opening and the passage, the slot forming a channel for the electrolyte between the opening and the passage. The slot has a bent portion whose radius of curvature is equal to or greater than 2.0 mm less than or equal to 200 mm.

A cell frame for a redox flow battery according to one aspect of the present invention comprises: a frame body according to an aspect of the present invention as described above; and a bipolar plate fitted in the opening of the frame body, wherein the frame body and the bipolar plate form a chamber in the frame body.

A redox flow battery according to one aspect of the present invention includes a cell frame for a redox flow battery according to an aspect of the present invention as described above.

ADVANTAGEOUS EFFECTS OF THE INVENTION

The above cell frame can improve heat dissipation of an electrolyte in a slot while reducing leakage current through the electrolyte, and can also suppress deformation caused on a formation portion of the slot. The above cell frame for a redox flow battery and the redox flow battery can improve heat dissipation of an electrolyte in a slit provided in a frame body forming a cell while reducing leakage current through the electrolyte, and can also suppress deformation Being created at a training section of the slot.

BRIEF DESCRIPTION OF THE FIGURES

1 is a schematic plan view of a frame body according to a first embodiment.

2 Fig. 12 is a schematic plan view of a cell frame incorporating the frame body according to the first embodiment.

3 FIG. 12 is a schematic cross-sectional view showing a cross-sectional shape of a slit in the frame body according to the first embodiment in an enlarged view. FIG.

4 is a schematic plan view of a frame body according to a second embodiment.

5 is a schematic plan view of a frame body according to a third embodiment.

6 FIG. 12 shows a model of a slot used to evaluate an exemplary test calculation 1.

7 FIG. 10 illustrates a method for calculating a deformation amount of a bent portion in an exemplary test calculation 1.

8th FIG. 10 shows a model of a slot used for evaluation of an exemplary test calculation 2.

9 shows a principle of operation of a redox flow battery.

10 is a schematic configuration of a cell stack.

DESCRIPTION OF THE EMBODIMENTS

[Description of the Embodiment of the Present Invention]

The present inventors have a slit provided in a frame body and having a bent portion, a configuration of the bent portion, a radius of curvature thereof, in particular, which can improve the heat dissipation of an electrolyte in the slit can suppress deformation applied to a formation portion of the slot is caused. The present inventors have obtained the following findings.

When a side stream causes generation of heat and the temperature of the electrolyte in the slot is increased, the heat of the electrolyte is discharged from a wall surface of the slot which contacts the electrolyte, and thus cooled. That is, the heat moves away from the electrolyte via the wall surface of the slot to the frame body, and heat dissipation of the electrolyte is consequently performed. When the slit has a bent portion with a small radius of curvature, the formation area of the bent portion in the plane of the frame body is small, and it is difficult to dissipate the heat of the electrolyte in the formed portion of the bent portion to the frame body, and thus the heat is easily trapped , Specifically, in the formed portion of the bent portion, the formation portion of the slot of the frame body has a formation area surrounded by two line segments connecting the center of the curvature radius of the bent portion and one and the other ends of the bent portion by the curved line along the bent portion , a small area (or volume) and has a small heat capacity and the temperature increases rapidly by the heat dissipation from the electrolyte. Accordingly, when the slit has a small radius of curvature in a bent portion, the heat dissipation to the frame body of the electrolyte is not sufficiently performed, and the heat is easily trapped at the formed portion of the bent portion. Accordingly, in the bent portion of the slot, the temperature of the electrolyte simply increases, and accordingly, an electrolyte component precipitates, the frame body becomes soft or other adverse effects are easily caused.

In contrast, when a frame body having a slit having a bent portion with a long radius of curvature, a tensile stress resulting from a fluid pressure, a thermal expansion, or the like is exposed, a component of a force acting on the arcuate portion of the slot in a normal direction acts (the width direction of the slot) increases. In particular, when a stress acts in a direction (for example, a longitudinal direction) of a workpiece constituting the frame body, it is decomposed in the bent portion of the slot into a component of a normal direction force and a component of the force in a tangential direction. The forming portion of the slit of the frame body is susceptible to stress in response to a force in the width direction of the slit, and when the slit has a bent portion having a large radius of curvature, the formation portion of the bent portion is simply loaded and hence liable to break.

• (1) Ein Rahmenkörper entsprechend einem Aspekt der vorliegenden Erfindung ist ein Rahmenkörper, der für eine Zelle einer Redox-Flussbatterie verwendet wird, umfassend: eine Öffnung, die in dem Rahmenkörper ausgebildet ist; ein Durchgang, durch welchen ein Elektrolyt im Kreis fließt; und einen Schlitz, der mit der Öffnung und dem Durchgang verbunden ist, wobei der Schlitz einen Kanal für das Elektrolyt zwischen der Öffnung und dem Durchgang ausbildet. Der Schlitz weist mindestens einen gebogenen Abschnitt auf, dessen Krümmungsradius gleich oder größer als 2,0 mm und kleiner oder gleich 200 mm ist.

The present inventors have completed the present invention based on the above idea. Embodiments of the present invention are numbered and described.

• (1) A frame body according to one aspect of the present invention is a frame body used for a cell of a redox flow battery, comprising: an opening formed in the frame body; a passage through which an electrolyte flows in a circle; and a slot connected to the opening and the passage, wherein the slot forms a channel for the electrolyte between the opening and the passage. The slot has at least one bent portion whose radius of curvature is equal to or greater than 2.0 mm and less than or equal to 200 mm.

According to the above frame body, since the slit has at least one bent portion, the slit may be longer than a straight slit, and a leakage current through the electrolyte in the slit may be reduced. In addition, the bent portion having a radius of curvature corresponding to the above range can improve the heat dissipation of the electrolyte in the slot and can also suppress stress occurring at a formation portion of the slot. In particular, a bent portion having a radius of curvature of 2.0 mm or more enables the formation area of the bent portion in the plane of the frame body to be large, and assists that the formed portion of the bent portion dissipates the heat of the electrolyte from the frame body and Heat is locked up less easily. Consequently, heat dissipation of the electrolyte can be improved, and increase of the temperature of the electrolyte can be suppressed. Accordingly, precipitation of an electrolyte component, softening and deformation of the frame body, and the like can be suppressed.

• (2) Als ein Aspekt des obigen Rahmenkörpers weist der obige Schlitz einen Verbindungsabschnitt, der einen Krümmungsradius von mehr als 200 mm aufweist, zwischen dem obigen gebogenen Abschnitt, der am nächsten zu der obigen Öffnung ist, und der obigen Öffnung auf.

In contrast, when a frame body having a bent portion with a large radius of curvature of 200 mm or less is subjected to tensile stress resulting from fluid pressure, thermal expansion or the like occurs at the bent portion of the slot in the normal direction (Width direction of the slot) and the tangential direction and a stress that occurs at the formation portion of the bent portion in the width direction of the slot is reduced so that it is small. Accordingly, deformation caused on a formation portion of the slit can be suppressed, and cracking can be suppressed. Preferably, the bent portion has a radius of curvature of, for example, 10 mm or more and 60 mm or less.

• (2) As one aspect of the above frame body, the above slot has a connection portion having a radius of curvature of more than 200 mm between the above bent portion closest to the above opening and the above opening.

• (3) Als den einen Aspekt des obigen Rahmenkörpers weist der Verbindungsabschnitt eine Länge von 5 mm oder mehr und 200 mm oder weniger auf.

When the electrolyte is introduced from the passage into the chamber through the slot, it passes through the bent portion and undergoes a centrifugal force (or inertia) accordingly. This inertia can interfere with a flow of the electrolyte introduced into the chamber, and thus it is possible for the electrolyte in the chamber to have an uneven flow rate profile. According to the above aspect, since a connecting portion having a radius of curvature of more than 200 mm (a curvature less than 1/200) is provided between the bent portion of the opening serving as the chamber, inertia can be absorbed That is, when the electrolyte flows through the bent portion, it is attenuated, and a disturbance of the flow of the electrolyte introduced into the chamber can be suppressed. Accordingly, the connection portion can provide a fitting effect for the flow which suppresses a disturbance of a flow of the electrolyte introduced into the chamber. This can balance a flow rate profile of the electrolyte in the chamber.

• (3) As the one aspect of the above frame body, the connecting portion has a length of 5 mm or more and 200 mm or less.

According to the above aspect, since the connection portion has a length of 5 mm or more, a disturbance of a flow of the electrolyte introduced into the chamber can be effectively suppressed, and a high adjustment effect for the flow rate can be achieved. In contrast, when a frame body having a connecting portion with a length of 200 mm or less is subjected to tensile elongation resulting from fluid pressure, thermal expansion or the like, a stress acting on the connecting portion of the slot is small , Accordingly, deformation caused at the connecting portion is suppressed and cracking is suppressed.

• (4) Als ein Aspekt des obigen Rahmenkörpers weist der Schlitz eine Tiefe von 0,5 mm oder mehr und 10 mm oder weniger auf.

Preferably, the connecting portion has a length of, for example, 10 mm or more and 50 mm or less.

• (4) As an aspect of the above frame body, the slot has a depth of 0.5 mm or more and 10 mm or less.

• (5) Als ein Aspekt des obigen Rahmenkörpers weist der obige Schlitz eine Breite von 0,5 mm oder mehr und 20 mm oder weniger auf.

The larger the cross section of the slot, the smaller the pressure loss when the electrolyte flows. According to the above aspect, the slit having a depth of 0.5 mm or more with a fixed width enables to have an increased cross-sectional area and enables to reduce the pressure loss. Moreover, when the electrolyte has a fixed flow rate, the larger the cross-sectional area is, the lower the flow velocity of the electrolyte is, and accordingly, a centrifugal force when the electrolyte flows through the bent portion is reduced and an improved flow adjusting effect can be achieved. In addition, since the slit has a depth of 10 mm or less, reducing the strength resulting from a reduced thickness at the formation portion of the slit results, the frame body are suppressed and deformation, cracking and the like by fluid pressure, thermal expansion and the like can be further suppressed. Moreover, since the slit has a depth of 10 mm or less, stress acting on the slit is further reduced, which helps to reduce the amount of deformation. Preferably, the slot has a depth of, for example, 1.00 mm or more and 5.00 mm or less. The depth of the slit means a length of the slit in the cross section of the slit in a direction perpendicular to the opening of the slit toward the bottom (ie, the direction of the thickness of the frame body). The width of the slot means a width of the opening of the slot in cross section.

• (5) As one aspect of the above frame body, the above slot has a width of 0.5 mm or more and 20 mm or less.

• (6) Als ein Aspekt des Rahmenkörpers weist der Rahmenkörper ein Paar lange Stücke, die einander gegenüber sind, und ein paar kurze Stücke auf, welche die Enden der lange Stücke verbinden und das lange Stück ist mit mindestens einem gebogenen Abschnitt, der oben beschrieben wurde, ausgebildet.

According to the above aspect, the slit having a width of 0.5 mm or more allows the slit having a fixed depth to have an increased cross-sectional area, thus enabling a reduced pressure loss. Moreover, as described above, a larger cross-sectional area allows for an improved adaptation effect for the flow. Moreover, since the slit has a width of 20 mm or less, reduction in strength of the formation portion of the slit of the frame body can be suppressed, and deformation, cracking and the like by fluid pressure, thermal expansion and the like can be further suppressed. In addition, since the slit has a width of 20 mm or less, the amount of heat generated by the electrolyte in the slit can be suppressed, and raising the temperature of the electrolyte is more easily suppressed. Moreover, since the slit has a width of 20 mm or less, the formation portion of the slit may be small, and the frame body, and hence the cell frame, may be downsized. Preferably, the slot has a width of 1 mm or more and 8 mm or less, for example.

• (6) As one aspect of the frame body, the frame body has a pair of long pieces facing each other and a few short pieces connecting the ends of the long pieces and the long piece having at least one bent portion described above , educated.

• (7) Als ein Aspekt des obigen Rahmenkörpers weist der Rahmenkörper ein paar lange Stücke einander gegenüber und ein paar kurze Stücke auf, welche die Enden der lange Stücke verbinden und eine Ecke, die durch das lange Stück und kurze Stück ausgebildet wird, weist mindestens einen gebogenen Abschnitt auf, der oben beschrieben ist.

When the bent portion of the slit formed in the long piece of the frame body is compared with the bent portion of the slit formed in the shorter piece of the frame body, the first one may be a greater distance from the bent portion to one or more at the other end of the piece provided with the bent portion (hereinafter also referred to as a bent portion forming piece). The larger this distance, the more material of the frame body is formed in a portion from the bent portion to one or the other end of the bent portion forming portion, so that when fluid pressure, thermal expansion and the like result in a load occurring in a longitudinal direction of the bent portion Training piece of the bent portion act, deformation is less easy and tearing is suppressed. Consequently, according to the above aspect, cracking, deformation and the like caused on the formation portion of the slot (the formation portion of the bent portion, in particular) can be further suppressed.

• (7) As one aspect of the above frame body, the frame body has a few long pieces facing each other and a few short pieces connecting the ends of the long pieces, and a corner formed by the long piece and short piece has at least one bent portion described above.

• (8) Ein Zellenrahmen für eine Redox-Flussbatterie entsprechend einem Aspekt der vorliegenden Erfindung umfasst: den Rahmenkörper entsprechend einem der Elemente (1) bis (7); und eine bipolare Platte, die in der Öffnung des Rahmenkörpers eingefasst ist, wobei der Rahmenkörper und die bipolare Platte eine Kammer in dem Rahmenkörper ausbilden.

The corner formed by the long piece and the short piece has high strength and thus is resistant to deformation. When the bent portion of the slit is formed at the corner of the frame body, and fluid pressure, thermal expansion and the like result in stress acting on a piece forming the frame body, deformation is less likely to occur and cracking is suppressed. Consequently, according to the above aspect, deformation, cracking and the like at the formation portion of the slot can be further suppressed.

• (8) A cell frame for a redox flow battery according to one aspect of the present invention comprises: the frame body according to any one of (1) to (7); and a bipolar plate enclosed in the opening of the frame body, wherein the frame body and the bipolar plate form a chamber in the frame body.

• (9) Eine Redox-Flussbatterie entsprechend einem Aspekt der vorliegenden Erfindung umfasst einen Zellenrahmen für eine Redox-Flussbatterie entsprechend dem obigen Element (8).

According to the above cell frame, since the above frame body is included according to one aspect of the present invention, in a frame body constituting a cell of a redox flow battery, heat dissipation of an electrolyte in a slot can be improved while preventing leakage current through the electrolyte can be, and a deformation caused at a slot portion can be suppressed.

• (9) A redox flow battery according to one aspect of the present invention includes a cell frame for a redox flow battery according to the above item (8).

According to the above redox flow battery, since the above cell frame according to one aspect of the present invention is contained in a frame body forming a cell, heat dissipation of an electrolyte in a slot can be improved, while leakage loss of the electrolyte can be reduced and a Stress caused on the formation portion of the slot can also be suppressed.

DETAILED DESCRIPTION OF EMBODIMENTS OF THE INVENTION

A specific example of the frame body and a cell frame for a redox flow battery according to an embodiment of the present invention will be described below with reference to the figures. In the figures, identical reference numerals designate identical or corresponding components. Note that the present invention is not limited to these examples and is intended to include modifications that are within the meaning and scope contained in the terms of the claims and an equivalent of the terms of the claims.

First Embodiment

<Frame body>

In reference to 1 to 3 For example, a frame body and a cell frame according to a first embodiment will be described. 1 represents a frame body 22 which is in the form of a rectangular frame, a few long pieces 22L opposite each other and a few short pieces 22S which shows the ends of the long pieces 22L connect, and an opening 22o is formed in the frame body. A bipolar plate 21 which will be described later is the opening 22o used. frame body 22 For example, it is formed of a vinyl chloride plastic, polypropylene, polyethylene, fluoro plastic, epoxy resin or other similar plastics or rubbers or the like.

frame body 22 includes a passage 200 (Passages 201 - 204 ) which penetrates the front and rear sides of the frame body and through which an electrolyte can flow, and a slot 210 (slits 211 - 214 ) formed on a surface of the frame body and a channel between passage 200 and opening 22o for the electrolyte is formed. passage 200 and slot 210 For example, at the same time as forming the frame body 22 be formed by injection molding.

(Passage and slot)

crossings 201 . 202 are in frame body 22 on a long piece 22L (in 1 a lower long piece) and passages 203 . 204 are in frame body 22 on the other long piece 22L (in 1 an upper long piece) formed. slots 211 . 213 are on frame body 22 formed on a surface side and slot 211 is on a long piece 22L trained and slot 213 is in another long piece 22L educated. The slots 212 . 214 are on the frame body 22 formed on the other surface side and slot 212 is on a long piece 22L and slot 214 is on the other long piece 22L educated. slots 211 - 114 each have their respective ends connected to passages 201 - 204 and the other ends connected with opening 22o on and slits 211 - 214 connect each passages 201 - 204 and the opening 22o in the frame body 22 is trained.

<Cell frame>

In reference to 2 becomes a cell frame constituting the frame body according to the first embodiment as shown in FIG 1 shown, includes, described. A cell frame 20 who in 2 is shown, includes a frame body 22 and a bipolar plate 21 in the opening 22o (please refer 1 ) of the frame body 22 is used. cell borders 20 has a frame body 22 designed to have a peripheral edge portion of the bipolar plate 21 from the front and rear sides of the frame body 22 sandwiching is with an outer perimeter of the bipolar plate 21 integrated by injection molding or the like. By fitting the bipolar plate 21 in the opening 22o of the frame body 22 is a depression (a chamber 24 ) through the frame body 22 and the bipolar plate 21 educated. In particular, the cell frame points 20 a chamber 24 on that in the frame body 22 by an inner peripheral surface of the frame body 22 and a surface of the bipolar plate 21 is trained, to pick up an electrode (not shown). In 2 is only one chamber 24 on a surface side (the front side of the sheet of the figure) of the cell frame 20 however, one chamber is also on the other side (the back of the sheet of the figure) of the cell frame 20 educated. A positive electrode is in the chamber on a surface side of the cell frame 20 and a negative electrode is in the chamber on the other surface side of the cell frame 20 and the positive electrode is on a surface side of the bipolar plate 21 arranged and the negative electrode is on the other side of the bipolar plate 21 arranged (see 11 ). The bipolar plate 21 may be formed a carbon fiber reinforced plastic.

For the cell frame 20 (Frame body 22 ), which is in 2 is shown are passages 201 and 203 Liquid supply passages and a liquid discharge passage for a positive electrode electrolyte and slits 211 and 213 are a liquid supply slot and a liquid discharge slot for the positive electrode electrolyte. crossings 202 and 204 are a liquid supply passage and a liquid discharge passage for a negative electrode electrolyte and slits 211 and 214 are a liquid supply slot and a liquid discharge slot for the negative electrode electrolyte. Hydration slots 211 . 212 extending from the fluid delivery passage 201 . 202 extend are with a lower edge portion of the chamber 24 (Opening 22o (please refer 1 )) and liquid drainage slots 213 . 214 extending from the fluid drain passage 203 . 204 extend are with an upper edge portion of the chamber 24 (Opening 22o ) connected. That is, the electrolyte in the chamber 24 from a lower side of chamber 24 is introduced and that electrolyte from an upper side of chamber 24 is drained. A flow adjustment section (not shown) is at the lower and upper edge portions of the chamber 24 formed along it. The flow adjusting portion has a function that slits the electrolyte that flows from the liquid supply 211 . 212 is introduced along the lower edge portion of the chamber 24 diffuses and collects the electrolyte from the upper edge portion 24 is discharged to the liquid discharge slots 213 . 214 , Through this flow adjustment section, the electrolyte passes from the lower edge portion of the chamber 24 through the interior of chamber 24 to the upper edge portion of the chamber 24 ,

The positive and negative electrolyte may be a known electrolyte. For example, the positive and negative electrolytes may be a V-based electrolyte containing V ions as an active material for the positive electrode and the negative electrode, a combination of Fe / Cr based electrolyte containing Fe ions as an active material for positive electrodes and Cr ions as a negative electrode active material, a Ti-Mn based electrolyte containing Mn ions as positive electrode active material and Ti ions as negative electrode active material, and the like are used ,

(Protective plate)

At the cell frame 20 at a portion of the frame body 22 at which the slots 211 to 214 are formed, a protective plate 40 , which is made of a plastic and protects an ion exchange membrane (see 11 ) can be arranged. The protective plate 40 is on a surface of a long piece 22L of the frame body 22 arranged to every slot 211 to 214 cover and any protective plate 40 A through-hole has a notch formed at a position that defines each passage 201 to 204 equivalent. In the case of the protective plate 40 , in the 2 is shown in the protective plate 40 attached to a surface side of the frame body 22 is arranged, on which slots 211 . 213 for an electrolyte for the positive electrode, a circular through-hole for passages 201 . 203 formed for the electrolyte of the positive electrode, whereas a rectangular notch for the passages 202 . 204 is formed for the electrolyte of the negative electrode. Unlike the protective plate 40 attached to the other surface side of the frame body 22 is arranged, in which slots 212 . 214 are formed for the electrolyte of the negative electrode is a rectangular notch for passages 201 . 203 for the electrolyte of the positive electrode, whereas circular through holes for passages 202 . 204 are formed for the electrolyte of the negative electrode. Through the protective plate 40 when a cell of a redox flux battery (see 11 ) is configured the cell frame 20 to use, none of the slots comes 211 to 214 in contact with the ion exchange membrane and the ion exchange membrane can be protected from damage by an irregularity of the slit. In 2 is only protective plate 40 which slots 211 . 213 covering, which is on a surface side of the frame body 22 are formed, but also a protective plate on the other surface side of the frame body 22 arranged to slots 212 . 214 cover.

(Planar shape of the slot)

1 shows in a circle an enlarged view of Schlitz 210 ( 211 ) in the frame body according to the first embodiment. 1 shows a planar / planar shape of slot 211 , In addition, shows 3 a cross-sectional shape of slot 210 and FIG. 12 is a schematic enlarged cross-sectional view taken along line III-III of FIG 1 was shown. As in 1 shown, the slot points 210 at least one bent section 35 on. Below with reference to 1 and 3 is a planar shape of the slot 210 of the first embodiment particularly described.

slot 210 ( 211 ) of the first embodiment has a single bent portion 35 and a connection section 36 between the bent section 35 and opening 22o on (Chamber 24 in cell frames 20 who in 2 is shown). In particular, slot is 210 the first embodiment in the form of the letter L, as in 1 shown, and from a straight section extending from the passage 200 ( 201 ) in a longitudinal direction (in 1 a longitudinal direction) of the long piece 22L of the frame body 22 extends, a curved section 35 which is connected to this straight section, and a connection section 36 formed in a width direction (a direction orthogonal to the longitudinal direction) of piece 22L extends.

(Curved section)

The bent section 35 has a radius of curvature r of 2.0 mm or more and 200 mm or less. slot 210 the first embodiment, which in 1 is shown has the bent portion 35 which is arcuate and has a central angle θ of substantially 90 °. The central angle of the bent portion means an angle formed between two line segments connecting the center of the radius of curvature of the bent portion and the one and the other ends of the bent portion. The bent section 35 preferably has a radius of curvature r of 10 mm or more and 60 mm or less.

(Connecting portion)

connecting portion 36 has a radius of curvature greater than 200 mm (a curvature less than 1/200) and also includes a straight portion (a curvature of zero). slot 210 who in 1 is shown has a connecting portion 36 up, that's just. connecting portion 36 preferably has a length of 5 mm or more 200 mm or less, and preferably 10 mm or more and 50 mm or less.

(Cross-sectional shape of the slot)

A cross-sectional shape of the slot 210 is essentially a rectangle that is in 3 is shown. The cross-sectional shape of the slot 210 is not limited to a rectangle and may be, for example, a quadrilateral such as an isosceles trapezoid, a triangle such as an isosceles triangle, a semicircle, a half ellipse, or the like. In particular, when the cross section of the slot is in the shape of a trapezium, the opening serves as a longer side and the bottom as a lower side, is a triangle, the bottom serves as a turning point and the opening serves as a base, or similar shape is, the side that has a larger width, closer to the opening than a side that is closer to the ground. In addition, the cross-sectional shape may have a chamfered edge or be formed in a curved surface.

(Depth and width)

The slot 210 preferably has a depth h of 0.5 mm or more and 10 mm or less and, moreover, 1 mm or more and 5 mm or less. slot 210 preferably has a width b of, for example, 0.5 mm or more and 20 mm or less and, moreover, 1 mm or more and 8 mm or less.

(Function and effect)

frame body 22 (Cell frame 20 ) according to the first embodiment, the slot 210 having a portion with the bent portion 35 can have a larger slot length than a single straight slot and thus can reduce leakage. In addition, the curved section 35 having a radius of 2 mm or more and 200 mm or less, Improve the heat dissipation of the electrolyte in the slot and suppress a deformation caused in the formation portion of the slot. In particular, allows the bent section 35 has a radius of curvature r of 2.0 mm or more that the formation area of the bent portion 35 in the plane of the frame body 22 (or the longer side 22L ) (ie an area in the figure that is in 1 circled, hatched) is large, enabling the formation section of the curved section 35 to have an increased heat capacity. This allows the formation portion of the bent portion to dissipate an increased amount of heat from the electrolyte and hence less susceptible to confining the heat. Consequently, the heat dissipation of the electrolyte can be improved, and an increase in the temperature of the electrolyte can be suppressed, and accordingly, precipitation of an electrolyte component, softening and deformation of the frame body, and the like can be suppressed.

In contrast, because frame body 22 holding the curved section 35 with a radius of curvature r of 200 mm or less, is subjected to tensile strain / stress resulting from fluid pressure, thermal expansion or the like, is a component of a force applied to the bent portion 35 of the slot 210 in a normal direction (ie, in the width direction of the slot) acts changed. In particular for the frame body 22 who in 1 is shown, for example, when a load in the longitudinal direction of the longer side 22L is a force in the bent section 35 distributed in the normal direction and the tangential direction and a load applied to the formation portion of the bent portion (a vicinity of both sides of the slot at the bent portion 35 ) is applied in the width direction of the slit is reduced so that it is small. Accordingly, deformation caused on the formation portion of the slot can be suppressed, and cracking can be suppressed.

In addition, there slot 210 (Liquid feed slot 211 ) a connecting section 36 An inertia can be absorbed when the electrolyte passes through the curved section 35 flows, be balanced and a disturbance of the flow of the electrolyte entering the chamber 24 introduced can be suppressed.

In particular, since the connecting section 36 may have a length of 5 mm or more, may interfere with the flow of the electrolyte entering the chamber 24 can be effectively suppressed and a high adaptation effect for the flow can be obtained. In addition, with a connection section 36 having a length of 200 mm or less when subjected to a strain load, a total load close to both sides of the slot at the connecting portion 36 will, be small. Accordingly, deformation occurring at the formation portion of the connection portion 36 is caused to be suppressed and a tearing can be suppressed.

In addition, the slot allows 210 having a depth h of 0.5 m or more, the fixed-width slot w has an increased cross-sectional area, and thus allows a reduced pressure loss. In addition, the slot allows 210 having a width w of 0.5 mm or more, that the fixed-depth slot h has an increased cross-sectional area and thus allows a reduced pressure loss. With the reduced pressure drop is an inertia that is absorbed when the electrolyte passes through the bent section 35 runs, reduces, which is an adjustment effect for the flow, in the connection 36 is provided, can improve. In addition, because of the slot 210 has a depth h of 10 mm or less and a width b of 20 mm or less, a reduction in the strength at the formation portion of the slot of the frame body 22 can be suppressed and deformation, cracking and the like by fluid pressure, thermal expansion and the like can be further suppressed.

Next will be based on 4 and 5 other examples of planar shapes of the slot 210 described. The following is slot 210 so that such a configuration similar to the above-described first embodiment will be denoted identically and will not be described, and mainly different points to the first embodiment will be described.

Second Embodiment

The first embodiment, which is in 1 has been described with reference to an example in which the bent portion 35 of the slot 210 andem frame body 22 on the long piece 22L is trained. 4 shows a second embodiment in which the bent portion 35 at a corner 22C of the frame body 22 is formed, at which the long piece 22L and the short piece 22S cross.

slot 210 of the second embodiment, which is in 4 is shown formed in the shape of a letter J and the bent portion 35 is in the form of a semicircular arc and has a central angle of substantially 180 °. Moreover, in the case of the second embodiment shown in Fig. 4, the liquid slots are shown 211 . 212 each the connecting section 36 connected to the opening 22o on a side edge of a lower end portion and liquid discharge slots 213 . 214 each have the connecting portion 36 connected to the opening 22o on a side edge of an upper end portion.

corner 22C of the frame body 22 is resistant to deformation by strain load resulting from fluid pressure, thermal expansion or the like. In the second embodiment, the bent portion 35 of the slot 210 at the corner 22C formed and the bent portion is therefore resistant to deformation.

Third Embodiment

While the first embodiment, in 1 has been described with reference to an example in which slot 210 a single curved section 35 can have multiple curved sections 35 be provided. In a third embodiment, the in 5 is shown, an aspect is described in which slot 210 several curved sections 35 having.

slot 210 of the third embodiment, which is in 5 is shown has a plurality of bent portions 35 on and has a connection section 36 between a bent section 35c the bent sections 35 on, the closest to the opening 22o and opening 22o is. The slot 210 , the several curved sections 35 can have a longer slot length and makes it possible to further reduce a side leakage. The bent section 35 has a central angle of, for example, 60 ° or more and 300 ° or less and, moreover, 80 ° or more and 180 ° or less, too.

In the following there will be described a redox flow battery having a cell frame according to the embodiment described above. When the cell frame is applied to the redox flow battery, it is used in the form of a cell stack formed to be composed of a cell frame, a positive electrode, an ion exchange membrane, and a negative electrode, each stacked in multiple layers are (see 10 ). And, a configuration is referred to in which the redox flow battery includes this cell stack.

[Exemplary test calculation 1]

The heat removal performance and an amount of deformation when the slot has a bent portion that varies in the radius of curvature were examined. Examination conditions are shown below.

In the exemplary test calculation 1, a model of a slot was developed 210 , which has a curved section 35 has, as in 6 shown used to the heat removal performance and the amount of deformation at the bent portion 35 to evaluate if the radius of curvature r of the bent portion 35 was varied in a range of 1 mm to 300 mm. slot 210 has a curved section 35 with a planar shape of one quarter of an arc (with a central angle of 90 °). In addition, the slot points 210 a cross-sectional shape in the form of a rectangle with the depth h of 1 mm and width w of 4 mm.

(Heat dissipation power)

The heat removal performance was determined by a ratio of an amount of heat through the electrolyte in the bent portion 35 and a heat capacity of the formation portion of the bent portion 35 in the frame body 22 (an increasing rate of the temperature ΔT, which will be described later). An amount of heat Q passing through the electrolyte in the bent section 35 was generated, and a heat capacity C of the curved section forming section 35 were obtained as follows:
(Amount of heat generated by the electrolyte) The amount of heat Q (W) generated was determined by the electrical resistance R (Ω) of the electrolyte in the bent portion 35 and a voltage in the slot v (V). The electrical resistance R is calculated by the specific resistance ρ (Ω · cm) by the following equation: R = ρ × (πr / 2) × (1 / wh). [Expression 1]

And the amount of heat Q that is generated is calculated by the following expression :: Q = v ² / R = v ² × (2wh / ρπr). [Expression 2]

The specific resistance ρ used in the above expression is set to 3.82 Ω · cm of the specific resistance of the V-based electrolyte used as an electrolyte of an RF battery. The voltage in slot v (V) is set at 10.5V from a voltage obtained by stacking 30 unit cells of a typical RF battery in layers.

(Heat capacity of the formation portion of the bent portion)

The heat capacity C (J / ° C) becomes the specific heat capacity Cp (J / cm 3 · ° C) of the frame body 22 and a volume V of the formation portion of the bent portion (cm ³ ). The specific heat capacity Cp becomes the specific heat c (J / kg · ° C) of the frame body 22 and a density d (g / cm ³ ) thereof is calculated by the following expression: Cp = c × d. [Expression 3]

The volume V is a volume of the frame body 22 at the formation area of the bent portion 35 of the frame body (an area which is in 6 hatched) and is calculated by the following expression. The frame body 22 has a thickness t of 5 mm for purposes of illustration. V = (πr ^2/4 ) × t [expression 4] and the heat capacity C is calculated by the following expression: C = Cp × V = Cp × (πr ² t / 4). [Expression 5]

The specific heat c and the specific gravity d used for the above expression became a frame body 22 assumed to be made of a vinyl chloride plastic, and the specific heat c is set to 840 J / kg · ° C and the density d is set to 1.4 g / cm ³ .

(Rate of increase of temperature)

From the generated heat quantity Q (W) and the heat capacity C (J / ° C) calculated by using the above expression, an increase rate ΔT (° C / sec) was calculated by the following expression: ΔT = Q / C = (v ² × 2wh / ρπr) / (Cp × (πr ² t / 4)) = (v ² × 2wh × 4) / (ρπr × Cp × πr ² t) = (8v ² / ρπ ² Cp) × (wh / r ³ t). [Expression 6]

<Evaluation of heat removal performance>

The radius of curvature r of the bent portion 35 was varied in a range of 1 mm to 100 mm, and the rate of increase of the temperature ΔT (° C / sec) was calculated, and on the basis of this, heat removal performance was evaluated. A smaller increase rate of the temperature ΔT means higher heat removal performance. The heat removal performance was rated as "A" for a rate of increase of the temperature ΔT having a value of 10 ° C / s or less, rated as "B" for a rate of increase of the temperature ΔT having a value of 500 ° C / s or less and rated as "C" for others. Values of the increase rate ΔT of the temperature and an evaluation of the heat removal performance are shown in Table 1.

(Amount of deformation)

An amount of deformation was caused by an entire load P by a fluid pressure applied to the formation portion of the bent portion 35 was applied, evaluated. The load P (N) was calculated by integrating a range of 0 ≦ θ ≦ π / 2 of a load by a unit fluid pressure p (N / mm) at a small portion of a central angle dθ at the bent portion 35 was applied at the XY plane, as in 7 shown, calculated. In this case, if load P in the x direction and the y direction was shared, as in 7 1, the load P as a product of the unit fluid pressure p (N / mm) and the radius of curvature r can be represented by the following equation: (X direction) P = ∫ (p × r × cosθdθ) = p × r (Y direction) P = ∫ (p × r × sinθdθ) = p × r [expression 7]

The unit fluid pressure p (N / mm) is provided as a product of the fluid pressure σ (MPa) and the depth h of the slot in millimeters by the following expression. Note that the fluid pressure σ is set to 0.5 MPa. p = σ × h [expression 8]

(Load)

Through the following expression, the load P (N) becomes at the bent portion 35 calculated and this load P is represented as P _r . P = p × r = σ × h × r [expression 9]

<Evaluation of the deformation amount>

The radius of curvature r of the bent portion 35 was varied in the range of 1 mm to 300 mm and the load P _r (N) was calculated based thereon and the amount of deformation was evaluated. A smaller load P _r means a smaller deformation at the bent portion 35 , The amount of deformation was expressed as "A" for loads P _r having a value of 50 (N) or less, "B" for loads P _r having a value of 100 (N) or less, and otherwise with " C "rated. Values of the load P _r and an evaluation of the amount of deformation are shown in Table 1.

<Overall>

Curved portions having radii of curvature shown in Table 1 were evaluated for overall rating based on evaluation of heat removal performance and amount of deformation. The overall rating is as follows: "A" when the heat removal power and the amount of deformation are both rated as "A" (or no "B" or "C" is present); "B" if at least one of the heat removal performance and the amount of deformation was rated as "B" and no "C" is present; and "C" if at least one of the heat removal performance and the amount of deformation was rated as "C". A result of this is shown in Table 1. [Table 1] Radius of curvature of the bent portion r (mm) 1.0 2.0 10 60 200 300 Heat removal capacity .DELTA.T 1593 199 1.6 7.4 × 10 ^-3 2.0 × 10 ^-4 5.9 × 10 ^-5 rating C B A A A A load amount P _r 0.5 1 5 30 100 150 rating A A A A B C Overall C B A A B C

From the result of the exemplary test calculation 1 shown in Table 1, it can be seen that a bent portion having a larger radius of curvature r allows a rate of increase of the temperature ΔT to have a smaller value, thus enabling higher heat dissipation performance a bent portion having a smaller radius of curvature allows a load P _{r to have} a smaller value and thus allows a smaller amount of deformation. And, if the radius of curvature r is 2 mm or more and 100 mm or less, it is considered that the improvement of the heat dissipation and the reduction of the amount of deformation can be obtained together. In particular, when the radius of curvature r is 10 mm or more and 60 mm or less, a Improvement of the heat dissipation and reduction of a deformation amount together with a high value can be obtained.

[Exemplary test calculation 2]

A fitting effect for a flux and an amount of deformation when a slot has a connecting portion that varies in length is evaluated. The evaluation conditions are set out below.

In an exemplary test calculation 2 is a model of the slot 210 , which has a curved section 35 and a connection section 36 , as in 8th has been shown to have been and an adaptation effect of the flow and a deformation amount of the connection portion 36 to analyze and evaluate if the length of a link section 36 is varied in a range of 1 mm to 300 mm. The slot 210 has a curved section 35 in a planar shape of one quarter of an arc (with a central angle of 90 °) and a radius of curvature r of 50 mm and has a connecting portion 36 in the form of a straight line. In addition, the slot points 210 a cross-sectional shape in the form of a rectangle having a depth h of 1 mm and a width w of 4 mm.

(Adaptation effect for the river)

The adaptation effect of the flow was determined by a ratio of a centrifugal force acting on the electrolyte through the bent section 35 flows, and the length of the connection section 36 (ie, a degree of drift D, which will be described later). The centrifugal force F acting on the electrolyte is obtained as follows:

(Centrifugal force of the electrolyte)

The centrifugal force F (N / m ³ ) was calculated with the density of the electrolyte m (kg / m ³ ) and the flow rate of the electrolyte u in (m / s) by the following expression: F = m × (u ² / r). [Expression 10]

If the flow rate of the electrolyte is Q (L / min), the flow rate is u (m / s) by the following expression: u = Q / (h × w). [Print 11]

In the above expression, the density has been assumed to be 1400 kg / m ³ and the flow rate Q has been assumed to be 1 L / min.

(Degree of drift)

A ratio of the centrifugal force F (N / m ³ ) acting on the electrolyte and a length a (mm) of the connecting portion 36 is defined as a degree of drift D, and a degree of drift D (N / m ⁴ ) is calculated by the following expression: D = F / a. [Printout 12]

<Evaluation of the adaptation effect of the flow>

The length a (mm) of the connection section 36 was varied in a range of 1 mm to 300 mm, and a degree of drift D (N / m ⁴ ) was calculated, and on the basis of this, a fitting effect of the flow was evaluated. A smaller degree of drift D means a higher adaptation effect for the flow. The fitting effect for the flow was evaluated as follows: "A" for a degree of drift having a value of 5.0 × 10 ⁷ (N / m ⁴ ) or less; "B" for a degree of drift having a value of 1.0 × 10 ⁸ (N / m ⁴ ) or less; and "C" else. Values of degree D of drift and an assessment of the adaptation effect of the flow are shown in Table 2.

(Deformation amount)

The deformation amount was measured by an entire load P by a fluid pressure applied to the forming portion of the connecting portion 36 is applied, evaluated. Load P (N) at the connecting portion 36 is represented as a product of a fluid pressure p (N / mm) and a length a (mm) by the following expression: P = p × a. [Expression 13]

A unit fluid pressure p (N / mm) is provided as a product of the fluid pressure σ (MPa) and the depth of the slit h (mm) by σ xh, as in the exemplary test calculation 1. Note that the fluid pressure σ is set to 0.5 MPa ,

(Load)

The following expression calculates the load P (N) and this load is called P _a . P = p × a = σ × h × a [expression 14]

<Evaluation of the deformation amount>

The length a (mm) of the connection section 36 was varied in a range of 1 mm to 300 mm and a load P _a (N) was calculated based thereon and the deformation amount was evaluated. A smaller load P _a means a smaller deformation at the connecting portion. The amount of deformation was represented as "A" for loads P _a having a value of 50 (N) or less, "B" for loads P _a having a value of 100 (N) or less, and otherwise with " C "rated. Values of the load P _a and an evaluation of the amount of deformation are shown in Table 1.

<Overall>

Joint portions having lengths shown in Table 1 were subjected to an overall evaluation based on an evaluation of the flow rate adjusting effect and an amount of deformation. The overall rating is as follows: "A" if the adaptation effect of the flux and the amount of deformation are both rated as "A" (or there is no "B" or "C");"B" if at least one of the adaptation effect of the flow and the amount of deformation was rated as "B" and no "C" is present; and "C" if at least one of the effect of adaptation of the flow and the amount of deformation was evaluated as "C". A result of this is shown in Tab. [Table 2] Length of the connection section a (mm) 1.0 5.0 10 50 200 300 Flow adjustment effect D 4.86 × 10 ⁸ 9.72 × 10 ⁷ 4.86 × 10 ⁷ 9.72 × 10 ⁶ 2.43 × 10 ⁶ 1.62 × 10 ⁶ rating C B A A A A load amount P _a 0.5 2.5 5 25 100 150 rating A A A A B C Overall C B A A B C

From the result of the exemplary test calculation 2 shown in Table 2, it can be seen that a connection portion having a longer length allows the degree of drift D to have a smaller value, and thus allows a higher adaptation effect of the flow and that a connecting portion having a shorter length allows the load P _{a to have} a smaller value, and thus allows a smaller amount of deformation. And if the length a is 5 mm or more and 100 mm or less, it is considered that an improved flow adjusting effect and a reduction in the amount of deformation may be present at the same time. In particular, when a length a 10 mm or more and 50 mm or less, an improvement in the effect of adjusting the flux and a reduction in the amount of deformation can occur simultaneously at a high level.

[Exemplary test calculation 3]

An adaptation effect of the flow and a deformation amount when the slot was varied in depth were evaluated. The evaluation conditions are shown below.

In an exemplary test calculation 3, the model was turned off 8th that was used in the exemplary test calculation 2, used to provide a fitting effect of the flow through the connection section 36 and a deformation amount at the bent portion 35 to analyze and evaluate if the depth h of the slot 210 in a range of 0.1 mm to 15 mm was. slot 210 has a curved section 35 with a planar shape of one quarter of an arc (with a central angle of 90 °) and a radius of curvature r of 20 mm. The connecting section 36 is straight and has a length of 50 mm. In addition, the slot points 210 a cross-sectional shape in the form of a rectangle with a width w of 4 mm.

<Evaluation of the adaptation effect of the flow>

The fit effect of the flux was evaluated as follows: The term described in Exemplary Test Calculation 2 was used to calculate the degree of drift D (N / m ⁴ ) with the depth h of the slot in a range of 0 , 1 mm to 15 mm was varied, and based thereon, an adaptation effect of the flow was evaluated. A smaller degree of drift D means a higher adaptation effect for the flow. The fitting effect for the flow was evaluated as follows: "A" for a degree of drift having a value of 5.0 × 10 ⁷ (N / m ⁴ ) or less; "B" for a degree of drift having a value of 1.0 × 10 ⁸ (N / m ⁴ ) or less; and "C" else. Values of the degree D of the drift and an assessment of the adaptation effect of the flow are shown in Table 3.

<Evaluation of the deformation amount>

The amount of deformation was evaluated as follows: The term described for Exemplary Test Calculation 1 was used to calculate a load P _r (N) with the depth h of the slot in a range of 0.1 mm to 15 mm, and based on this, the amount of deformation was evaluated. The amount of deformation was expressed as "A" for loads P _r having a value of 50 (N) or less, "B" for loads P _r having a value of 100 (N) or less, and otherwise with " C "rated. Values of the load P _r and an evaluation of the amount of deformation are shown in Table 3.

<Overall>

Slit having depths shown in Table 1 were subjected to an overall evaluation based on evaluation of the effect of adaptation of the flow and an amount of deformation. The overall rating is as follows: "A" if the adaptation effect of the flux and the amount of deformation are both rated as "A" (or there is no "B" or "C");"B" if at least one of the adaptation effect of the flow and the amount of deformation was rated as "B" and no "C" is present; and "C" if at least one of the effect of adaptation of the flow and the amount of deformation was evaluated as "C". A result of this is shown in Tab. [Table 3] Depth of the slot h (mm) 0.1 0.5 1.0 5.0 10 15 Flow adjustment effect D 2.43 × 10 ⁹ 9.72 × 10 ⁷ 2.43 × 10 ⁷ 9.72 × 10 ⁵ 2.43 × 10 ⁵ 1.08 × 10 ⁵ rating C B A A A A load amount P _r 1 5 10 50 100 150 rating A A A A B C Overall C B A A B C

From the result of the exemplary test calculation 3 shown in Table 3, it can be seen that a slit having a greater depth h allows a degree of drift to have a smaller value, and thus allows a higher adaptation effect of the flow and that a slit having a smaller depth h allows the load P _r laid to have a smaller value, and thus allows a smaller deformation. And if the depth h is 0.5 mm or more and 10 mm less, it is considered that the improvement of the effect of adaptation of the flow and the reduction of the amount of deformation can be simultaneously achieved. In particular, when depth h is 1 mm or more and 5 mm or less, an improvement in the fitting effect of the flow and a reduction in the amount of deformation can be simultaneously obtained at a high level.

[Exemplary test calculation 4]

An adjustment effect on the flow rate and heat removal performance when the width of the slot was varied was evaluated.

In an exemplary test calculation 4, the model was turned off 8th that was used in the exemplary test calculation 2, used to provide a flow adaptation pressure through the connection section 36 and a heat dissipation performance at the bent portion 35 to analyze and evaluate, if the slot 210 was varied in its width in a range of 0.1 mm to 25 mm. slot 210 has a curved section 35 in a planar shape of one quarter of an arc (with a central angle of 90 °) and a radius of curvature r of 10 mm. The connecting section 36 is straight and has a length of 100 mm. In addition, the slot has a cross-sectional shape in the form of a rectangle with a depth h of 1 mm.

<Evaluation of the adaptation effect of the flow>

The fit effect of the flux was evaluated as follows: The term described in Exemplary Test Calculation 2 was used to calculate the degree of drift D (N / m ⁴ ) with the width w of the slot in a range of 0 , 1 mm to 25 mm was varied, and based thereon, an adaptation effect of the flow was evaluated. A smaller degree of drift D means a higher adaptation effect for the flow. The adaptation effect for the flow was evaluated as follows: "A" for a degree of drift having a value of 5.0 × 10 ⁸ (N / m ⁴ ) or less; "B" for a degree of drift having a value of 1.0 × 10 ¹⁰ (N / m ⁴ ) or less; and "C" else. Values of degree D of drift and an assessment of the adaptation effect of flow are shown in Table 4.

<Evaluation of heat removal performance>

The heat removal performance was evaluated as follows: The term used for the exemplary test calculation 1 was used to calculate the rate of increase of the temperature ΔT (° C / s) with the width of the slit w in a range of 0.1 mm to 25 mm, and based on this, the heat dissipation performance was evaluated. The heat removal performance was evaluated as "A" for a rate of increase of the temperature ΔT having a value of 5 ° C / s or less, rated as "B" for a rate of increase of the temperature ΔT having a value of 8 ° C / s or less and rated as "C" for others. Values of the rate of increase ΔT of the temperature and an evaluation of the heat removal performance are shown in Table 4.

<Overall>

Slits having widths shown in Table 1 were subjected to an overall evaluation based on evaluation of the heat removal performance and a flow adaptation effect. The overall rating is as follows: "A" when the flow adaptation effect and the heat removal performance are both rated as "A" (or there is no "B" or "C");"B" if at least one of the adaptation effect of the flow and the heat removal performance has been evaluated as "B" and no "C" is present; and "C" if at least one of the adaptation effect of the flow and the heat removal performance was evaluated as "C". A result of this is shown in Tab. [Table 4] Width of the slot w (mm) 0.1 0.5 1.0 8.0 20 25 Flow adjustment effect D 3.89 × 10 ¹⁰ 1.56 × 10 ⁹ 3.89 × 10 ⁸ 6.08 × 10 ⁶ 9.72 × 10 ⁵ 6.22 × 10 ⁵ rating C B A A A A Heat removal capacity .DELTA.T 0040 0199 0398 3186 7965 9957 rating A A A A B C Overall C B A A B C

The result of the exemplary test calculation 4, which in 4 4, it can be seen that a slit having a larger width allows the degree of drift to have a smaller value, and thus allows a higher adaptation effect of the flow, and that a slit having a smaller width w, allows rate of elevation of the temperature to have a smaller value, thus allowing higher heat removal performance. And when the width w is 0.5 mm or more and 20 mm or less, it is considered that the improvement of the flow rate adjusting effect and an improvement in the heat dissipation can be simultaneously obtained. In particular, when the width w is 1 mm or more and 8 mm or less, improvement of the flow rate adjustment effects and improvement in heat dissipation can be achieved simultaneously at a high level.

INDUSTRIAL APPLICABILITY

The frame body and cell frame of the present invention is suitably applicable to a component of a redox flow battery.

LIST OF REFERENCE NUMBERS

100

 cell

101

 Ion exchange membrane

102

 Cell with positive electrode;

104

 positive electrode

103

 Cell with negative electrode;

105

 negative electrode

106

 Tank for positive electrode electrolyte

108, 110

 Passage;

112

 pump

107

 Tank for electrolyte of the negative electrode

109, 111

Passage;

113

 pump

20

 cell borders

21

 bipolar plate

22

 frame body

22L

 long piece;

22S

 short piece;

22o

 opening

24

 chamber

200

 passage

201, 202

 Liquid supply passage

203, 204

 Liquid discharge passage

210

 slot

211, 212

 Liquid feed slot

213, 214

 Liquid discharge slot

35, 35a-35c

 curved section

36

 connecting portion

40

 protection plate

50

 sealing element

10S

 cell stack

250

 endplate

300

 Redox flux battery (RF battery)

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• JP 2013-080613 [0007]
• JP 2002-246061 [0007]

Claims (9)

A frame body for use in a cell of a redox flow battery, comprising: an opening formed in the frame body; a passage through which an electrolyte can flow in a circle; and a slot connected to the opening and the passage, the slot forming a channel for the electrolyte between the opening and the passage, wherein the slot has at least one bent portion whose radius of curvature is equal to or greater than 2 mm and less than or equal to 200 mm. The frame body according to claim 1, wherein the slot has a connecting portion having a radius of curvature of more than 200 mm between the bent portion closest to the opening and the opening. The frame body according to claim 2, wherein the connection recess has a length of 5 mm or more and 200 mm or less. The frame body according to any one of claims 1-3, wherein the slot has a depth of 0.5 mm or more 10 mm or less. The frame body according to any one of claims 1-4, wherein the slot has a width of 0.5 mm or more and 20 mm or less. A frame body according to any one of claims 1-5, comprising a pair of long pieces facing each other and a pair of short pieces connecting the long pieces at their ends, the long piece being provided with at least one bent portion. A frame body according to any one of claims 1-6, comprising a pair of long pieces facing each other and a pair of short pieces connecting the long pieces at their ends, one corner formed by the long piece and the short piece is having at least one bent portion. Cell frame for a redox flow battery, comprising: Frame body according to one of claims 1-7; and a bipolar plate inserted in the opening of the frame body, wherein the frame body and the bipolar plate form a chamber in the frame body. A redox flow battery comprising a cell frame for a redox flow battery according to claim 8.

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